| Grammichele to Oberkirch | 848.73 mi (1,365.90 km) |
| Grammichele to Obernburg am Main | 914.09 mi (1,471.08 km) |
| Grammichele to Obernkirchen | 1,073.87 mi (1,728.22 km) |
| Grammichele to Oberschleissheim | 778.04 mi (1,252.14 km) |
| Grammichele to Oberstdorf | 738.43 mi (1,188.39 km) |
| Grammichele to Obertraubling | 821.31 mi (1,321.77 km) |
| Grammichele to Obertshausen | 933.47 mi (1,502.27 km) |
| Grammichele to Oberursel | 946.28 mi (1,522.89 km) |
| Grammichele to Ochsenfurt | 888.83 mi (1,430.43 km) |
| Grammichele to Ochsenhausen | 786.72 mi (1,266.10 km) |
| Grammichele to Ochtrup | 1,096.99 mi (1,765.44 km) |
| Grammichele to Odenthal | 1,023.72 mi (1,647.52 km) |
| Grammichele to Oelde | 1,058.33 mi (1,703.22 km) |
| Grammichele to Oelsnitz | 920.30 mi (1,481.09 km) |
| Grammichele to Oer-Erkenschwick | 1,060.03 mi (1,705.96 km) |
